Ferrarisite - Occurrence, Properties, and Distribution

Ferrarisite is a triclinic-pinacoidal mineral, consisting of oxygen, hydrogen, calcium, and arsenic.

It was named after Professor Giovanni Ferraris, who worked on the crystal structures of various arsenate minerals.

Properties of Ferrarisite

The following are the key properties of Ferrarisite:

  • Cell Data
    • Space Group: P1
    • a = 8.294(4)
    • b = 6.722(3)
    • c = 11.198(5)
    • α= 106.16(4)°
    • β = 92.94(4)°
    • γ = 99.20(4)°
    • Z = 1

  • Crystal Data
    • Triclinic
    • Point Group: 1
    • Crystals, flattened on {110}, slightly elongated along [110], with pseudohexagonal outline, to 300µm
    • X-ray powder pattern: 10.81 (10), 2.831 (9), 3.170 (8), 4.07 (4), 3.573 (4), 6.34 (3), 5.36 (3)

  • Chemical Composition
    Elements Content 1 Content 2
    As2O5 49.3 49.95
    CaO 30.6 30.47
    MgO 0.52
    H2O 19.4 19.58
    Total 99.8 100.00

  • Optical Properties
    • Optical Class: Biaxial (+)
    • Orientation: X ^ c = 17°
    • Z ⊥ {110}
    • Dispersion: Strong
    • α = 1.562(2)
    • β = 1.572(2)
    • γ = 1.585(2)
    • 2V(meas.) = ?90°
    • 2V(calc.) = 83°

  • Estimated Properties
    Electron density Bulk density (electron density) = 2.57 g/cm3
    Note: Specific gravity of Ferrarisite = 2.60 g/cm3
    Photoelectric PEFerrarisite = 1.07 barns/electron
    U = PEFerrarisite x ρElectron density = 2.75 barns/cm3
    Fermion index Fermion index = 0.16
    Boson index = 0.84
    Radioactivity
    Ferrarisite is not radioactive

How to Identify Ferrarisite

Ferrarisite is white in color or colorless. It has a transparent luster, a white streak, and a perfect cleavage.

The density of ferrarisite is 2.63 g/cm3.

Global Distribution

Ferrarisite is distributed in the following places:

  • Gabe-Gottes mine, Rauenthal, near Sainte-Marie-aux-Mines, Haut-Rhin
  • Duranus, Alpes-Maritimes, France
  • Anton mine, Heubachtal near Schiltach, Wittichen, Germany
  • Black Forest, in the Bauhaus district
  • Richelsdorf Mountains, Hesse
  • Ramsbeck, North Rhein-Westphalia

Occurrence of Ferrarisite and Useful Mineral Association

Ferrarisite occurs as a post-mine, low-temperature reaction product of carbonate gangue, having arsenical solutions derived from arsenic.

References

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